CompuServe Messages

I posted another message. Maybe you can help. I have now debugged the setup and have Win95 and Jet Direct driving my HP4M with no server. But a new problem has arisen. If I set up another PC identically on the same network cable as the first one, only one of the two PC's is granted access to the printer. It can be either one, but whichever "sees" the printer on the network first prevents the other from doing so. Is there some trick here? Both machines are set up identically, including addresses, etc. Thanks.